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Tun US ram ah khuakheng heh a ram pum ai 64% ah tlung 1950 kum hnua lam ah tun heh a roh ber ii. US agriculture department in a ram song ai ram ngaw 48 song in 29 ai hmun 1,297 heh laivum harsahnak tawk hmun (Primary natural disaster areas) tiin phuang ii.
1956 kum an tun heh US ah ruahti tlawm ber ai khuakheng le khuasa ber caan tiin official lam in phuang ii. Lonaitu te in khai 1930 kum dung ah US ah khuakheng in dinaih harsa in a um awnghnak a pipu te in rel de hnak heh tun san ah tuar pan hang tiin reel vek hang ii.
U.S Department of Agriculture in zarh hmasa lam ah US ram pui ai 38% in lo in rong suak tlawm ze ai he hlan zarh hmasa ah 30% hnak in hnawm sawn thu phuang ii.
Cen, US ram ai thing le hampa po hmun ram te khai ram pum ai 54% heh a hnawm roh thu USDA in 1995 kum ah tun heh a roh ber ti ii.
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